Weed screen for thrashing machines



Deb. 8, 1925.

' N. R. KRAUSE WEED. SCREEN FOR THRASHING MACHINES Filed Sept. 5, 1924 3 Sheets-Sheet l I N VEN TOR. .j/NAW /Q Wwf/.55,

Dec. 8 1925. 1,564,585

. N..R.KRAusE NEED 'SCREEN Fon THRASHING MACHINES Filed sept. 5, 1924 ATTORNEY.

Dec. 8 1925. 1,564,585

N. R. KRAUSE WEEDSCREEN FOR THRASHING MACHINES Filed Sept. 5, 1924 5 Sheets-Sheet 5 ATTORNEY.

. vester-thrasher,

y harvester-'thrashe Patented A8, 1,925.4

UNITED STATES PATENT OFFICE.

NORMAN R. KRAUSE, 0F RACINE, WISCONSIN, ASSIGNOR T0 J. I. CASE THBESHING- MACHINE COMPANY, 0F RACINE,-

WISCONSIN, A CORPORATION.

SCREEN FOR THRASHING MACHINES.

Application led September 5, 1924. Serial No. 786,161.

To all wtam t may concern.'

Be it known that I, NORMAN R. KRAUsE, a citizen of the United States, residin at Racine, in the county of Racine and ySgtate of Wisconsin, have invented certain new and useful Improvements in Weed Screens for Thrashing Machines, of which the following is a specification.

In the operation of a combination harvester-thrasher, wheat in the field is cut at a time when weed seeds are in green condition, and, becoming mingled with wheat kernels, the mechanical separation of such seeds therefrom is extremely diiicult when employing ordinary devices of which I am aware, as weed seeds are generally vof a sticky and clinging nature and quickly clog vibrating sieves and the like. For the purpose of separating weed seeds and shriveled grain from wheat kernels I provide an improved rotating screen in connection with a desired, which I have demonstrated in practice is hlghly efficient, and is devised in such manner as to prevent clogging by the materials and kept in cleaned condition, as` will hereinafter appear.

In the accompanying drawings, forming part hereof, Figurel is a fragmentary perspective in chain lines of a combined harmy improved rotary screen being shown in full linesattached to the thrasher; Fig. 2 an elevation of the device part of the same being shown ,in section as taken on the .dotted line 2 2 in Fig. 3' Fig. 3 an elevation looking from the'right toward the end ofthe dev1ce;-Fig. 4 a section of the screen looking in the direction lindicated by the arrows 4 4 in Fig. 2; Fig. 5 a transverse section through the rotaryscreen showing the cleaningl brush applied thereto and taken on the dotted line 5 5 in Fig. 2; Fig. 6 a longitudinal section through saidy brush as seen when looking in the direction of the arrows 6 6 in Fig. 5; Fig. -7 an enlarged Vlongitudinal section through the screen; Fig. 8 an elevation of the driving gear as seen when looking in the direction lndicated by the arrows 8 8 in Fig. 7, and 79 a section on the dotted 1 In said drawings, the portions marked 5,

or otherwise as may 'be wardly therefrom and which discharges thrashedv grain from the machine to the ordinary elevator, in turn conveys the grain upwardly in a well known manner and discharges it into the short spiral conveyor, 10, Fig. 2.

My improvement consists. essentially in a rot-ary screen as a whole comprising the drum, 11, encased in housing, 12, in which drum is positioned a large auger, 13, the latter together with spiral conveyor, 10, be-

ing mounted upon shaft, 14, thus constituting a continuous conveyor from elevator 9 through the screen drum 11. Said drum 11 at its driven end is carried by a spider comprising the arms, 15, which are secured to a clutch faced hub, 16, engaging with driving hub, 17, as will be further explained. The opposite end of said drum is mounted upon a sleeve, 18, secured to head, 19, of housing 12, and wooden or other blocks, 20, are fastened to ysaid rotating drum and revolve with it about sleeve 18, which constitutes the journal for the floating end of said rotary drum. The large auger 18 comprising the flights, 22, and 14 b by t 1e braces, 23, i's secured to shaft the spiders 24, clamped to said shaft .adjusting eye bolts, 25, soas to turn with the shaft, which auger in connectionwith spiral conveyor, 10, forms a continuous conveyor as heretofore indicated. The outer 9, Vattached thereto, which stationary head, 26, of screen housing 12 i tion to that of said auger, said clutch gear 32 being loosely mounted on shaft 14 and clutching with hub 16 of weed screen spider 15.I l

' Depending from casing 12 is a hopper,V 35, to which a spout, 36', is attached for delivering weed seeds and the like to sacks or other receptacles, while at thenouter side of ,said casing a spout, 37, is attached for dlschargscreen and which o 15 to the space communicating w1thsaid .spout 37.

As heretofore indicated, considerable difing the grain which has traveled across the passes between the spiders" ficulty is experienced ,by weedv seeds and other materials sticking mto or clinging to the screen drum perforations or interstices of wire meshing'when the latter is used, and to remed this condition I provide a brush, 40, whic is inserted through ing, 12, longitudinally of screen drum 11, and maintained in position by spring holders, as 41, so that the wires or brist es ofthe brush will be constantly pressed into said drum with the result that as the latter is rotating such material will be brushed away and the screen thus kept in cleaned condition, and the liner particles thus permitted to p'ass through the drum perforation without obstruction.

As the elevator 9 is driven from its lower end, it transmits motion to the rotary screen by means of the sprocket-and-chainsystem, 43, (Fig. 2), and as grain is delivered from said elevator to spiral conve or 10 itis propelled thereby inwardly to tire rotary drum Y and is caused to travel through the same by the act-ion of auger 13. As` said auger screws the grain in the directlon of grain s kut 3'( therotary screen 11 1s rotating s owly in the opposite direction, which actionyseverely agltates the material and sifts it thoroughly so that the fine weed seeds, shrivelled grain and minute foreign articles fall through the weed spout 36, W ile the grain separated therefrom is moved to the outer end of the' drum and delivered into rain spout 37 through the outlet formed' y the wall, 50,'and head 26 of the screen housing. In practice I have demonstrated the advantage of employing a rotating weed screen in which the auger rotates'in one direction andthe screen drum in the other, both at varylng speeds for the reason that weed screen comprising a housing,y a shaft f .therem extendlng to said elevator and having -a spiral conveyor thereon extending in said housing, a spira `conveyor on said shaft extending into saidv elevator, an auger on said shaft cooperating with said conveyor y for propelling material, a screen drum on said shaft, and surrounding said auger, means for rotating said shaft, and means for rotating said drum in a direction opposite to the rotation of said shaft. f.

3. The combination, with "an elevator, of a weed screen comprising a casing, spouts dependent from said casing, a shaft mounted in said casing and extending to said elevator, a spiral conveyor on said shaft extending into said weed screen, spiders on said shaft, braces supported by said spiders, flights mounted on said braces, a screen drum surrounding said flights, driving mechanism on said casing clutched to said screen drum, and means for operatin said elevator to rotate said shaft and sai drum in opposite directions.

4. In a weed screen, a housing, a screen drum therein embodying a clutch member, a shaft for lsupport-ing said drum, an auger in said drum and mounted on said shaft, driving mechanism embodying a clutch en- Ua'ging said clutch member, and means for driving said shaft and au erin one direction whereby said driving mec anism rotates said drum in an opposite direction.

5. In a Weed Screen, a shaft', a spiral conveyor mounted on said shaft, a screen drum mounted on said shaft and surrounding said conveyor, driving mechanism mounted on said shaft and connected to said drum for rotating the same oppositely to said conveyor, and a brush adapted to engage said ldrum for cleanin the same.

In testimony w ereof I aix my signature.

NORMAN R. KRAUSE. 

